Air pump



FIG. 1 is a perspective view of an air pump showing our new design;

FIG. 2 is a side view of the air pump of FIG. 1, the opposite side being understood to be a mirror image of the side shown; and,

FIG. 3 is a top plan view of the air pump of FIG. 1. 

The ornamental design for an air pump, as shown and described. 